CHRONIC BENEFIT COVER THAT DOES NOT MAKE SENSE

I am on chronic benefit for my hormone tablets, 1mg of this tablet did not help much with my symptoms, my doctor increased my dose to 2mg, ehich Discovery covered, it helped but only for part of 24h. I stared taking 1mg in the morning and 1mg at night, which worked. Discovery will pay for 2mg, but not for 2 x 1mg? I have to have my doctor write a motivation before they will cover this! So I must waste my time and money for a doctor visit so he can write a motivation, what I tell him to write, why? Why does Discovery not trust their members and force them to incur unnecessary expenses and just make it difficult for their members!!!!!!